Boss 302 Manifold Issues

121AK

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Last month I installed a used Boss 302 manifold. I used the previous owner's injectors and fuel rails as his had less miles than mine. I also installed a new Steeda intake tube, JLT catch can and new spark plugs (NGK 6510).

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I had Lund tune the car. Interested to see new HP numbers, I had the car dyno'd at 2 different shops. Here's the second shops dyno graph:

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As you can see, I'm leaving 100+ horsepower somewhere. This just doesn't make sense. I'm not sure where to look. I emailed Lund but they haven't responded to my last email in a couple days.
 

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Recon

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295rwhp for a Boss manifold Coyote? There’s something seriously wrong. Is there a CEL?


Pick your poison.
 

13COBRA

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When you drive it, does it feel like a Prius?

If it feels ok on the street, I'd say you're having traction issues.
 

121AK

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295rwhp for a Boss manifold Coyote? There’s something seriously wrong. Is there a CEL?


Pick your poison.

There's no CEL. I've tried to see if there are any codes, there are not.

When you drive it, does it feel like a Prius?

If it feels ok on the street, I'd say you're having traction issues.

When I initially got it all setup, my butt dyno said it was quicker. I have some pretty wide tires on the rear. I don't think I have enough power to be slipping.
 

13COBRA

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There's no CEL. I've tried to see if there are any codes, there are not.



When I initially got it all setup, my butt dyno said it was quicker. I have some pretty wide tires on the rear. I don't think I have enough power to be slipping.

Your butt dyno would know if you were down 100hp.
 

bottle fed 14

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My boss manifold stock throttle body Cook's 1 and 7/8 inch headers 3 inch off road X lethal 4C converter made 426hpto the tires 376 torque
 

121AK

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Your butt dyno would know if you were down 100hp.

That's the bad thing, I'm second guessing it now that 2 different dynos have both read around 250-300hp.

We are having issues with my knock sensors on the nitrous tunes by that's different. I'm running Lund's NA Boss 302 tune right now.
 

basspro302

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The torque curve looks messed up. And why would you only pull a boos mani car to 6k? Thats when they start to pick up power. Are you filling up with 87 lol
 

121AK

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The torque curve looks messed up. And why would you only pull a boos mani car to 6k? Thats when they start to pick up power. Are you filling up with 87 lol

I've been filling up at the local Shell station. Buddy said he's had issues with their gas so I swapped stations and filled up tonight. Hopefully that helps. I had no hand in the dyno'ing of the car. The guys revved the car that high.

Why didn't you guys rev the car to 7500rpm?

Sent from my [device_name] using the svtperformance.com mobile app

The dyno guys didn't for some reason but if you rev past 7100, the car just falls on it's face.
 

96gt02

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None of this sounds right lol, those graphs are wacked, power shouldn't fall off till about 7500, and unless your running 25% water in your fuel, no amount of bad gas would do this
 

GNBRETT

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U didn't make a full pull at 6k. Probably another 100+ hp between 6k-7500k
 

96gt02

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^ This is not true, every boss intake dyno ive ever seen makes at least 370 HP by 6K
 

sur_real1

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Do you have a reputable speed shop in the area? I'd take it there and have them go over the car with a fine tooth comb.
A. Dyno sheet looks goofy as F*
B. Unless you're running watered down 87 octane fuel, you shouldn't be down that much power (are you running watered down 87 octane fuel)
C. Maybe she's hurt bad. Cams not actuating properly? Compression down?

If Tl;dr, take to professional :)
 

121AK

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Update:

My tuner at Lund got back to me and had me pull all the plugs to look for cracks in the porcelain. I just replaced all spark plugs last week and they still look pretty good.

He's thinking it could be a fuel delivery issue now. I have no idea what it could be.
 

121AK

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Do you have a reputable speed shop in the area? I'd take it there and have them go over the car with a fine tooth comb.
A. Dyno sheet looks goofy as F*
B. Unless you're running watered down 87 octane fuel, you shouldn't be down that much power (are you running watered down 87 octane fuel)
C. Maybe she's hurt bad. Cams not actuating properly? Compression down?

If Tl;dr, take to professional :)

A friend of mine was having misfires on our local Shell 93 octane. Which I always thought was good. So yesterday I swapped out to a full tank of 93 at a different station.

I reached out to a local speed shop to see how comfortable they are with coyotes. If they are, I'm going to drop it off while I'm on my next work trip.
 

clinton2003

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you may take it to a local track. see if lund can schedule some time to go back and fourth. if he can, make sure you have a wireless hot spot (your smart phone should work), log at the track, and send them to lund. between that and your mph you should know exactly if you are or are not down on power.

do you have logs to look at? are you seeing knock? + knock is BAD. and if your fuel was a major issue, you would see that. watch load, your at sea level you should be in the 90's. commanded and measured lambda for the car, they should be close to one another. (really close)
 

121AK

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you may take it to a local track. see if lund can schedule some time to go back and fourth. if he can, make sure you have a wireless hot spot (your smart phone should work), log at the track, and send them to lund. between that and your mph you should know exactly if you are or are not down on power.

do you have logs to look at? are you seeing knock? + knock is BAD. and if your fuel was a major issue, you would see that. watch load, your at sea level you should be in the 90's. commanded and measured lambda for the car, they should be close to one another. (really close)

We do have a track about an hour away. I'm about to leave for a work trip here soon for a month. So time is running out for me to figure this out.

I uploaded a data-log for anyone to look at. Just a little WOT pull.
 

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